chore(config): GitHub to Gitea is the default, every other host is beta (#386)

The GitLab and Gitea / Forgejo sources and the Forgejo, GitHub and GitLab destinations show a beta pill and beta wording; the docs say GitHub to Gitea is the supported path. Testing every source and destination pair against real hosts turned up three bugs, fixed here: the pull mirror path never recorded a row's destination host, reconcile counted rows mirrored to a previous destination as missing, and the first push into a freshly created GitLab project failed because the host reports it as not found for a couple of seconds.

docs/API.md

@@ -144,6 +144,7 @@ Nothing is deleted or archived on either side by this call; the cleanup service
     "notManaged": [{ "location": "me/notes", "reason": "not a mirror" }],
     "unverified": [],
     "healthyCount": 41,
+    "elsewhereCount": 0,
     "scannedOwners": ["e2e_admin", "github-mirrors"],
     "skippedOwners": ["starred"],
     "totalOnDestination": 43

docs/ENVIRONMENT_VARIABLES.md

@@ -69,13 +69,13 @@ Notes:
 
 ## GitHub Configuration
 
-Settings for connecting to the source host. GitHub is the default. GitLab and Gitea/Forgejo (including Codeberg) are selected with `SOURCE_PROVIDER`; the username and token variables below then hold the account and token for that host. See [SOURCE_PROVIDERS.md](SOURCE_PROVIDERS.md) for what each source supports.
+Settings for connecting to the source host. GitHub is the default and, together with a Gitea destination, the supported path; every other source or destination is beta. GitLab and Gitea/Forgejo (including Codeberg) are selected with `SOURCE_PROVIDER`; the username and token variables below then hold the account and token for that host. See [SOURCE_PROVIDERS.md](SOURCE_PROVIDERS.md) for what each source supports.
 
 ### Basic Settings
 
 | Variable | Description | Default | Options |
 |----------|-------------|---------|---------|
-| `SOURCE_PROVIDER` | Which host repositories are pulled from. `gitea` also covers Forgejo and Codeberg. | `github` | `github`, `gitlab`, `gitea` |
+| `SOURCE_PROVIDER` | Which host repositories are pulled from. `gitea` also covers Forgejo and Codeberg. Anything other than `github` is beta. | `github` | `github`, `gitlab`, `gitea` |
 | `SOURCE_URL` | Base URL of the GitLab or Gitea/Forgejo instance. Ignored for GitHub, which uses `GH_API_URL`. | `https://gitlab.com` for GitLab, `https://codeberg.org` for Gitea | e.g. `https://gitlab.example.com` |
 | `GITHUB_USERNAME` | Your username on the source host | - | - |
 | `GITHUB_TOKEN` | Personal access token for the source host. GitHub needs the `repo` and `admin:org` scopes, GitLab `read_api` and `read_repository`, Gitea/Forgejo `read:repository`, `read:user` and `read:organization`. | - | - |
@@ -155,7 +155,7 @@ Settings for the destination. Gitea and Forgejo are pull mirrors; GitHub and Git
 
 | Variable | Description | Default | Options |
 |----------|-------------|---------|---------|
-| `DESTINATION_PROVIDER` | Which host mirrors are created on. Gitea and Forgejo share one API (labels and hints differ). GitHub and GitLab (beta) receive `git push` of branches and tags from this app. | `gitea` | `gitea`, `forgejo`, `github`, `gitlab` |
+| `DESTINATION_PROVIDER` | Which host mirrors are created on. Gitea and Forgejo share one API (labels and hints differ). GitHub and GitLab receive `git push` of branches and tags from this app. Anything other than `gitea` is beta. | `gitea` | `gitea`, `forgejo`, `github`, `gitlab` |
 | `GITEA_URL` | Destination instance URL. Optional for GitHub and GitLab, which default to github.com and gitlab.com; set it for GitHub Enterprise Server or a self hosted GitLab. | - | Valid URL |
 | `GITEA_EXTERNAL_URL` | Optional external/browser URL used for dashboard links. API and mirroring still use `GITEA_URL`. | - | Valid URL |
 | `GITEA_TOKEN` | Gitea access token | - | - |

docs/PUSH_TARGETS.md

@@ -2,7 +2,7 @@
 
 Gitea and Forgejo are pull mirrors: the app asks them to fetch from the source, and they keep the copy up to date themselves. GitHub has no pull mirror API and GitLab only offers one on paid tiers, so for those two the app runs a push engine instead. This page explains what that engine does, what it needs, and what it does not do.
 
-Push targets are marked **beta** in the destination dropdown.
+Push targets are marked **beta** in the destination dropdown, like every source and destination other than GitHub to Gitea. They are tested end to end against github.com and gitlab.com, but have had less time in the field than the default path.
 
 ## How it works
 

docs/SOURCE_PROVIDERS.md

@@ -1,6 +1,6 @@
 # Source Providers
 
-The destination card has a matching **Destination** dropdown with Gitea and Forgejo. They share the same API, so it only changes the name, icon and hints shown on the card (`DESTINATION_PROVIDER` sets it from the environment).
+GitHub to Gitea is the supported default. Every other source and every other destination is marked **beta** in the dropdowns: they are tested end to end against real hosts, but have had less time in the field. The destination card has a matching **Destination** dropdown with Gitea, Forgejo (beta, same API as Gitea), GitHub (beta) and GitLab (beta); `DESTINATION_PROVIDER` sets it from the environment, and [PUSH_TARGETS.md](PUSH_TARGETS.md) covers the GitHub and GitLab targets.
 
 Gitea Mirror pulls repositories from one source host per user. GitHub is the default. GitLab and Gitea/Forgejo are available from the **Source** dropdown at the top of the connection card on the Configuration page.
 
@@ -8,9 +8,9 @@ Gitea Mirror pulls repositories from one source host per user. GitHub is the def
 |--------|--------|----------------------|
 | GitHub | github.com, GitHub Enterprise (via `GH_API_URL`) | `https://github.com` |
 | GitLab (beta) | gitlab.com, self hosted GitLab | `https://gitlab.com` |
-| Gitea / Forgejo | Codeberg, self hosted Gitea or Forgejo | `https://codeberg.org` |
+| Gitea / Forgejo (beta) | Codeberg, self hosted Gitea or Forgejo | `https://codeberg.org` |
 
-GitLab support is marked beta: the adapter is tested against the public API and mocked responses, not yet against a private self hosted instance. Picking GitLab or Gitea/Forgejo shows an **Instance URL** field. Leave it empty for the default instance, or enter the base URL of your own (for example `https://gitlab.example.com` or `http://gitea.local:3000/gitea`). The username and token fields hold the account and token for the selected host.
+Picking GitLab or Gitea/Forgejo shows an **Instance URL** field. Leave it empty for the default instance, or enter the base URL of your own (for example `https://gitlab.example.com` or `http://gitea.local:3000/gitea`). The username and token fields hold the account and token for the selected host.
 
 ## Tokens